I’ve got a minor issue with my drivetrain (3×9). If I’m riding the largest or middle chain ring and shift to any of the lowest (largest) sprockets on my cassette, the chain tries to drop down from the chainring onto the next one; I’ve got no issues riding the full range of the cassette in the granny ring. If I shift back down the cassette the chanin stays on the ring it’s meant to be on.
Since I shouldn’t be riding extreme gears it’s not really a problem but I was just wondering what might be going on. It’s behaved list this was transferred from another (identical geometry) frame and shifts without issue in the stand (it’s load on the drivetrain that seems to trigger it).
The mech hanger seems fine and the chain length isn’t a problem either (as far as I can tell) and the limit screws are correctly set (a new rear mech. didn’t change anything either).